I can only speak to the West Side of MI, but I think your friend is addled.
1) I have never been approached by a LEO because of OC.
2) I have had many LEO encounters while OCing, but for other reasons, e.g. witnessing traffic accidents, dealing with neighbor problems. All encounters have been very positive.
3) Many here have 'paved the way' to normalize the armed, law abiding citizen.
Now, you may want to consider personal appearance as a 'trigger' for unfavorable LEO interactions. If you look nonthreatening, they'll pass you by. Put on a hoodie, let your pants ride at your knees, or have a swastika carved in your forehead, you may have a different experience.
I attribute my favorable experience to gray hair, professional style, and the fact that I look like a LEO, as well as the groundwork laid by those before me.
While OC is about a tactical choice, but it is also seen as a political statement; you may be approached by citizens and LEOs with differing opinions on the 2nd Amendment. You always want to be winsome; never confrontational. Be prepared by studying interactions reported on this and other forums (Open Carry Experiences).
If you do not have your CPL, OC can be problematic, with a patchwork of laws designed to trap the unwary. Study them thoroughly. If you have a CPL, its a bit easier, but still, know the laws. Its easy to get jammed up.
